Perhaps you should try some spelling variations:
tran thanh » ban thanh, van thanh, quan thanh
hoc chieu » hoc thieu, ho chieu, hoc dieu
tran tuan » tran xuan, tran quang, tranh luan
dang cong » dung cong
cong tap » cuong tap, cong tac, cong tan
tap toan » tap doan, tap quan, bai toan
toan ban » van ban

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc chieu) or (hoc hien)) xanh - thanh ((tran tuan) OR (tran thanh)) dang cong tap toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc chieu) OR (hoc hien)) xanh - thanh ((tran tuan) OR (tran thanh)) dang cong tap toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc chieu) or (hoc hien)) xanh - thanh ((tran tuan) OR (tran thanh)) dang cong tap toan ban".
• Adding a wildcard symbol may retrieve word variants: ((hoc chieu) or (hoc hien)) xanh - thanh ((tran tuan) OR (tran thanh)) dang cong tap toan ban*.